Dragon Ball Z Episode 54: Guru`s Gift
Episode 54 of 291 of Dragon Ball Z, aired July 4, 1990, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Krillin and Dende finally reach Guru's home, where the eldest Namek explains the history of the Dragon Balls as well as Piccolo's unusual origin. Sensing Krillin's innate goodness, Guru awakens Krillin's latent powers and gives him the last Dragon Ball.